Well b. doesn't make much sense so let's look at a. The three main causes of sea level rise are: (1) thermal expansion of sea water as it warms up, (2) melting of land ice and (3) changes in the amount of water stored on land. This suggests that sea levels could rise even if global surface temperatures remained static. So that rules out a. as well.

C) Both are correct according to alarmists. To them, ___________ (bill in the blank with anything) is proof of anthropogenic global warming.

Neither one. GW extremists would tell us that if hell was freezing over, That in itself is GW! There no facts concerning their GW theories.

A

both are